Fleet Desktop: Wire transparency URL to end user

[RachelElysia]

Issue

Closes #39465

Description

• Surface URL to API and then to UI

Screenrecording of fix

Screen.Recording.2026-02-13.at.4.28.11.PM.mov

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

Testing

• QA'd all new/changed functionality manually

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.60%. Comparing base (338bb64) to head (8e25710).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/hosts/details/DeviceUserPage/DeviceUserPage.tsx	33.33%	2 Missing ⚠️
...sts/details/DeviceUserPage/InfoModal/InfoModal.tsx	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #39869      +/-   ##
==========================================
- Coverage   66.26%   64.60%   -1.67%     
==========================================
  Files        2439     2438       -1     
  Lines      195403   195423      +20     
  Branches     8641     8645       +4     
==========================================
- Hits       129485   126253    -3232     
- Misses      54190    57570    +3380     
+ Partials    11728    11600     -128     

Flag	Coverage Δ
backend	66.14% <100.00%> (-1.92%)	⬇️
frontend	54.16% <33.33%> (-0.01%)	⬇️

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[RachelElysia]

Not sure if (or how) we need to edit the hardcoded link in the MDM SSO page #34835 cc: @sgress454

[rachaelshaw]

Heads up: I wrote down the wrong route in the bug description (that'll teach me to trust old issues 😅), we should be able to use the existing API.